There's no shortage of cable management options, but often times you need to employ a few different options in order to keep yours neat, tidy, and accessible. When you want to add flexibility and position cables virtually anywhere, a suction cup is your best friend. Instructables user openproducts explains how easy it is:

Based on an existing suction cup the easy cable clip is very easy to make, without any special skills or tools: two cuts with a simple knife is all it takes to upgrade a suction cup into an 'easy cable clip sucker version.'

Suction cups naturally have a little nub on top. You just make your clip there and stick your cable inside. Then you can attach it to a wall or other surface with ease. For more information and in-depth instructions, hit up the full post over at Instructables.